STRANGE TYPE OF FLY THAT CANNOT FLY!?!?

Question

I have recently moved to South Africa,  outer rural Johannesburg area. I have a fly infestation (maybe not that bad but they are driving me crazy! ) which I am addressing...not my question.

However, I have encountered a very strange type of fly...I have only seen one individual like this, about once a month for the last 3 months, since moving here. It is very bright metallic, almost pearl green with copper highlights, very red eyes. Its almost pretty! Fully formed, but DOES NOT FLY! Just walks, but is as big as the other "normal" flies. If it was defective then it wouldn't have survived to that size? I can't find any info online about this "species"? 

HELP!  I am from Ireland where there are basic insects....never mind the poisonous snakes and spiders here,  this mutant fly has me freaked!

Answer

Green Bottle Fly

The name green bottle fly or greenbottle fly is applied to numerous species of Calliphoridae or blow fly, in the genera Lucilia and Phaenicia (the latter is sometimes considered a subgenus of the former).
Distribution

These flies are found in most areas of the world, primarily the Western Hemisphere and especially California and Australia, and the most well-known species is the common greenbottle, Lucilia sericata (or Phaenicia sericata, depending on authority), though there are other common species such as Lucilia caesar, Lucilia cuprina, Lucilia coeruleiviridis, and Lucilia illustris.
en.wikipedia.org/wiki/Green_bottle_fly

Bottle flies are also called blowflies and the maggots are widely used in medical treatments because they only eat dead flesh.

STRANGE TYPE OF FLY THAT CANNOT FLY!?!?

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